{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:WEVNAMEBT5E6Z6JLPPXO25ZA3D","short_pith_number":"pith:WEVNAMEB","canonical_record":{"source":{"id":"2504.13305","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"eess.SY","submitted_at":"2025-04-17T19:34:26Z","cross_cats_sorted":["cs.SY"],"title_canon_sha256":"bfd18ebace829903a1f65c6e556d21bee3e9b938d91978c9292b829b0a303538","abstract_canon_sha256":"2ead1f68a2036c377da79800b3b64cef4e709d8081f6fa2a60f95edef13b6fe7"},"schema_version":"1.0"},"canonical_sha256":"b12ad030819f49ecf92b7beeed7720d8feba019a736f6ac1d0da1b6634bf0025","source":{"kind":"arxiv","id":"2504.13305","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2504.13305","created_at":"2026-07-05T10:50:52Z"},{"alias_kind":"arxiv_version","alias_value":"2504.13305v1","created_at":"2026-07-05T10:50:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2504.13305","created_at":"2026-07-05T10:50:52Z"},{"alias_kind":"pith_short_12","alias_value":"WEVNAMEBT5E6","created_at":"2026-07-05T10:50:52Z"},{"alias_kind":"pith_short_16","alias_value":"WEVNAMEBT5E6Z6JL","created_at":"2026-07-05T10:50:52Z"},{"alias_kind":"pith_short_8","alias_value":"WEVNAMEB","created_at":"2026-07-05T10:50:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:WEVNAMEBT5E6Z6JLPPXO25ZA3D","target":"record","payload":{"canonical_record":{"source":{"id":"2504.13305","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"eess.SY","submitted_at":"2025-04-17T19:34:26Z","cross_cats_sorted":["cs.SY"],"title_canon_sha256":"bfd18ebace829903a1f65c6e556d21bee3e9b938d91978c9292b829b0a303538","abstract_canon_sha256":"2ead1f68a2036c377da79800b3b64cef4e709d8081f6fa2a60f95edef13b6fe7"},"schema_version":"1.0"},"canonical_sha256":"b12ad030819f49ecf92b7beeed7720d8feba019a736f6ac1d0da1b6634bf0025","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T10:50:52.956205Z","signature_b64":"cziSyzqsN2qIifKhhI9IEmlvcpHmOK6oVOYYxekDvrq/dAYMTW3wsvHfD540PZ0BuEDaVJNAEc+PFCZjBgvuCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b12ad030819f49ecf92b7beeed7720d8feba019a736f6ac1d0da1b6634bf0025","last_reissued_at":"2026-07-05T10:50:52.955738Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T10:50:52.955738Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2504.13305","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T10:50:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BXXzUE0nHubO5v4JanCVMsIJFmonE0t02IUV71IOyL1uVDUP3jC/qFHQ6RIx45u1VihyZU5e0aXolnVj2xv5Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-15T14:55:16.081580Z"},"content_sha256":"8d43c408404b924dc4b9a10cc5a42b468cf81b075962aefcb92d2ace9b6021fa","schema_version":"1.0","event_id":"sha256:8d43c408404b924dc4b9a10cc5a42b468cf81b075962aefcb92d2ace9b6021fa"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:WEVNAMEBT5E6Z6JLPPXO25ZA3D","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Implementation of Field Programmable Gate Arrays (FPGAs) in Extremely Cold Environments for Space and Cryogenic Computing Applications","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":["cs.SY"],"primary_cat":"eess.SY","authors_text":"Christopher Lewis, Drew Sellers, Michael Hamilton","submitted_at":"2025-04-17T19:34:26Z","abstract_excerpt":"The operation of CMOS Field Programmable Gate Arrays (FPGAs) at extremely cold environments as low as 4 K is demonstrated. Various FPGA and periphery hardware design techniques spanning from HDL design to improvements of peripheral circuitry such as discrete voltage regulators are displayed, and their respective performances are reported. While general operating conditions for voltage regulators are widened, FPGAs see a broader temperature range with improved jitter performance, reduced LUT delays, and enhanced transceiver performance at extremely low temperatures."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2504.13305","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2504.13305/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T10:50:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MMgjnWV4oSq44Mh4wn6xdliEtr3K6Jzrc5s9M0TeZRAhotx8UuQtoET9sIw/tupr5RUF4hNTyLouspaq7EutCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-15T14:55:16.082146Z"},"content_sha256":"5a3b75ce294f38cdee56e96991694a7a3f11afe63de58b54013a9e73a62f7894","schema_version":"1.0","event_id":"sha256:5a3b75ce294f38cdee56e96991694a7a3f11afe63de58b54013a9e73a62f7894"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WEVNAMEBT5E6Z6JLPPXO25ZA3D/bundle.json","state_url":"https://pith.science/pith/WEVNAMEBT5E6Z6JLPPXO25ZA3D/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WEVNAMEBT5E6Z6JLPPXO25ZA3D/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-15T14:55:16Z","links":{"resolver":"https://pith.science/pith/WEVNAMEBT5E6Z6JLPPXO25ZA3D","bundle":"https://pith.science/pith/WEVNAMEBT5E6Z6JLPPXO25ZA3D/bundle.json","state":"https://pith.science/pith/WEVNAMEBT5E6Z6JLPPXO25ZA3D/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WEVNAMEBT5E6Z6JLPPXO25ZA3D/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:WEVNAMEBT5E6Z6JLPPXO25ZA3D","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"2ead1f68a2036c377da79800b3b64cef4e709d8081f6fa2a60f95edef13b6fe7","cross_cats_sorted":["cs.SY"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"eess.SY","submitted_at":"2025-04-17T19:34:26Z","title_canon_sha256":"bfd18ebace829903a1f65c6e556d21bee3e9b938d91978c9292b829b0a303538"},"schema_version":"1.0","source":{"id":"2504.13305","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2504.13305","created_at":"2026-07-05T10:50:52Z"},{"alias_kind":"arxiv_version","alias_value":"2504.13305v1","created_at":"2026-07-05T10:50:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2504.13305","created_at":"2026-07-05T10:50:52Z"},{"alias_kind":"pith_short_12","alias_value":"WEVNAMEBT5E6","created_at":"2026-07-05T10:50:52Z"},{"alias_kind":"pith_short_16","alias_value":"WEVNAMEBT5E6Z6JL","created_at":"2026-07-05T10:50:52Z"},{"alias_kind":"pith_short_8","alias_value":"WEVNAMEB","created_at":"2026-07-05T10:50:52Z"}],"graph_snapshots":[{"event_id":"sha256:5a3b75ce294f38cdee56e96991694a7a3f11afe63de58b54013a9e73a62f7894","target":"graph","created_at":"2026-07-05T10:50:52Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2504.13305/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The operation of CMOS Field Programmable Gate Arrays (FPGAs) at extremely cold environments as low as 4 K is demonstrated. Various FPGA and periphery hardware design techniques spanning from HDL design to improvements of peripheral circuitry such as discrete voltage regulators are displayed, and their respective performances are reported. While general operating conditions for voltage regulators are widened, FPGAs see a broader temperature range with improved jitter performance, reduced LUT delays, and enhanced transceiver performance at extremely low temperatures.","authors_text":"Christopher Lewis, Drew Sellers, Michael Hamilton","cross_cats":["cs.SY"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"eess.SY","submitted_at":"2025-04-17T19:34:26Z","title":"Implementation of Field Programmable Gate Arrays (FPGAs) in Extremely Cold Environments for Space and Cryogenic Computing Applications"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2504.13305","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:8d43c408404b924dc4b9a10cc5a42b468cf81b075962aefcb92d2ace9b6021fa","target":"record","created_at":"2026-07-05T10:50:52Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"2ead1f68a2036c377da79800b3b64cef4e709d8081f6fa2a60f95edef13b6fe7","cross_cats_sorted":["cs.SY"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"eess.SY","submitted_at":"2025-04-17T19:34:26Z","title_canon_sha256":"bfd18ebace829903a1f65c6e556d21bee3e9b938d91978c9292b829b0a303538"},"schema_version":"1.0","source":{"id":"2504.13305","kind":"arxiv","version":1}},"canonical_sha256":"b12ad030819f49ecf92b7beeed7720d8feba019a736f6ac1d0da1b6634bf0025","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b12ad030819f49ecf92b7beeed7720d8feba019a736f6ac1d0da1b6634bf0025","first_computed_at":"2026-07-05T10:50:52.955738Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T10:50:52.955738Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"cziSyzqsN2qIifKhhI9IEmlvcpHmOK6oVOYYxekDvrq/dAYMTW3wsvHfD540PZ0BuEDaVJNAEc+PFCZjBgvuCA==","signature_status":"signed_v1","signed_at":"2026-07-05T10:50:52.956205Z","signed_message":"canonical_sha256_bytes"},"source_id":"2504.13305","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8d43c408404b924dc4b9a10cc5a42b468cf81b075962aefcb92d2ace9b6021fa","sha256:5a3b75ce294f38cdee56e96991694a7a3f11afe63de58b54013a9e73a62f7894"],"state_sha256":"ba85aad6a4e2f55dc6b93b68174a5eb52471a8bff958ed52684634758977e085"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kln2W2AFJO9Xr9HeOGIGBn2vgv98TccKMJkorRNW/7Wn1FgEA+xe2NTvLWe/w7L9A5vdF9d7MynJGp1Tt0eMBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-15T14:55:16.086257Z","bundle_sha256":"a45ca2780a4bee91b9c81d79eb5b8e976e59f67bf10d1d1b8d81a65d95e97db8"}}